Application of Endoscopic Ultrasound Combined with Multislice Spiral CT in Diagnosis and Treatment of Patients with Gastrointestinal Eminence Lesions

Objective To evaluate the application of endoscopic ultrasound (EUS) combined with multislice spiral CT (MSCT) in the diagnosis and treatment of patients with gastric eminence lesions. Methods A total of 160 patients with gastric eminence lesions enrolled in our hospital from June 2018 to June 2021 were included and received EUS and MSCT. The results of the two examinations and the postoperative pathological results were compared. Results The common pathological types of gastric eminence lesions include polyps and stromal tumors, with the most common sites of lesions in the gastric antrum, followed by the fundus of the stomach and the gastric body. Gastric eminence lesions mostly originate from the mucosal layer and muscularis mucosa, accounting for 83.13% of the total. With pathological results as the gold standard, the detection rate of MSCT was 90.63%, and that of EUS was 78.13%. With the joint diagnosis as a reference, the receiver operating curve (ROC) revealed a higher diagnostic efficiency of MSCT and EUS. Conclusion The accuracy of MSCT in the diagnosis of gastric eminence lesions is significantly higher than that of EUS, both of which can offer useful guidance for the choice of endoscopic treatment methods. The combination of MSCT and EUS examination before endoscopic gastroscopy may provide a better treatment efficacy on gastric protruding lesions with high safety.


Introduction
Gastric eminence lesions are mostly caused by the compression of extramural organs or lesions and the large folds of the gastric mucosa [1][2][3]. Gastric eminence lesions are caused by the degeneration and necrosis of the vagus nerve and sympathetic nerve, resulting in abnormal secretion of various intestinal hormones and changes in the intestinal environment [4]. Currently, the diagnostic efficiency of the property and origin of the lesion by electronic gastroscopy is poor, so endoscopy and multislice spiral CT (MSCT) are frequently used in clinical practice for preoperative diagnosis to provide a guidance for subse-quent treatment [5][6][7][8]. Endoscopic ultrasound (EUS), with ultrasound and endoscopy, can clearly show the digestive tract wall, adjacent organs, and tissues, which helps clarify the cause of the lesion by preliminarily determining the property of the lesion according to its echo characteristics [9][10][11][12]. MSCT can clearly show the depth, location, and size of tumor infiltration and can effectively determine the presence of lymph node metastasis in the lung, mediastinum, and distal organ tissues. EUS allows direct visualization of mucosal lesions in the gastrointestinal tract, while real-time scanning can be performed using endoscopic ultrasound, thus further improving diagnostic accuracy. To further enhance the treatment efficacy of gastric eminence lesions this study explored the application value of EUS combined with MSCT in the diagnosis of patients with gastric eminence lesions to provide a clinical reference of endoscopic treatment.

Inclusion Criteria.
Patients who were diagnosed with gastric eminence lesions after receiving electronic gastroscopy in our hospital and received endoscopic treatment after further determination of the range and property of the lesions by EUS and MSCT, with complete clinical data, and who were fully informed of the purpose and process of the study and provided written informed consent were included.

Exclusion Criteria.
Patients with progressive gastric cancer; with external pressure lesions; with other serious organic diseases, coagulation dysfunction, or malignant tumors; and with cognitive impairment, communication impairment, or physical impairment were excluded.
2.4. Methods. EUS examination: the examination was carried out using an ultrasound host (model: Fuji SU-8000) + EUS (model: Fuji EG-530UT), equipped with 12, 15, and 20 MHz ultrasound probes. Small superficial lesions were inspected with the 12 MHz ultrasound microprobe. The water filling method and the water bag technique were used, and the frequency and scanning method of the ultrasound probe was switched according to the size and location of the lesion [13][14][15][16].
MSCT examination: the patients fasted for 8 hours, drank 600-1000 ml of water 20 minutes before the examination, and received 20 mg of amidoamine (Fujian Sanai Pharmaceutical Co., Ltd., Approval No. H35020158) through intramuscular injection. With the patients in a supine position according to the conditions of the gastric lesions, a plain CT scan was performed, ranging from the right side of the diaphragm to the duodenum, with a voltage of 120 KV, a current of 250-300 mA, a thickness of 5 mm, a pitch of 1.25, and reconstruction thickness of 0.625 mm [17][18][19][20]. Then, contrast CT was performed after the injection of the iopromide (Schering Pharmaceutical Co., Ltd., Approval No. H10970166) using a high-pressure syringe, with an injection speed of 3.5 ml/s. Arterial phase was scanned 30 s after injection covering the esophagus, abdomen, and whole stomach, and venous phase was scanned 60 s after the injection to observe the tissue damage adjacent to the lesion and the liver and distant metastasis.
The imaging examination results of all patients were diagnosed by two radiologists and sonographers.
Endoscopic treatment was performed for some eminence lesions, including high-frequency electrocoagulation resection, mucosal resection, mucosal dissection-tumorectomy, mucosal dissection-tumor excision plus titanium clip closure, and puncture sclerotherapy; some submucosal tumors were surgically removed, and pathological examination was performed. Mucosal dissection-tumor tumorectomy uses a double-port therapeutic endoscope. A snare is placed through one port to cover the mucosal tissue on the tumor surface, and high-frequency electrical resection of the surface mucosa is performed, or a needle knife is used to cut the mucosal tissue on the surface of the tumor to expose the submucosal tumor; then, a biopsy forceps is used through another hole to clamp the tumor and lift it up, and a snare is used to cover the tumor at the bottom of the tumor, to perform high-frequency electrical resection.

2.5.
Postoperative Follow-Up. The patients received reexamination by gastroscopy at 3, 6, and 12 months after surgery to obtain the patient recovery data. Biopsy was performed again to determine the occurrence of local recurrence if necessary.
2.6. Statistical Analyses. The data obtained in this study were analyzed using SPSS20.0 software, and GraphPad Prism 7 (GraphPad Software, San Diego, USA) was used to plot the graphics. The counting data are expressed as n(%) and analyzed using the chi-square test. The measurement data are expressed as mean ± SD and analyzed using the t-test. The specificity and sensitivity of receiver operating curve (ROC) and the area under the curve (AUC) were calculated. Differences were considered statistically significant at P < 0:05. Sensitivity = number of true positives/ðnumber of true positives + number of false negativesÞ * 100%; specificity = number of true negatives/ðnumber of true negatives + number of false positivesÞ * 100%. The sensitivity and specificity of this study are for the detection of gastric eminence lesions, with no subdivision of the disease.

The Distribution of Gastric Eminence
Lesions. The distribution of the lesions of 160 patients was analyzed. The diameter of gastric eminence lesions was about 1:47 ± 0:95 cm. The common pathological types of gastric eminence lesions include polyps and stromal tumors, with the most common sites of lesions in the gastric antrum, followed by the fundus of the stomach and the gastric body. The pathological types of the gastric antrum were mostly polyps, of the fundus lesions were mostly stromal tumors, of the gastric body lesions were mainly polyps on the greater curvature side, and of the gastric angle were chiefly malignant (Table 1).

Histological Characteristics of Gastric Eminence Lesions.
Gastric eminence lesions mostly originate from the mucosal layer and muscularis mucosa, accounting for 83.13% of the total ( Table 2).    3 Disease Markers of MSCT was 90.63%, and that of EUS was 78.13% (X 2 = 9:4815, P = 0:005). The preoperative MSCT examination did not provide a clear diagnosis result for 15 patients, with gastric antrum being the most common lesion (40%) and muscularis mucosa being the most common level of lesion causes (46.67%). The preoperative EUS examination did not provide a clear diagnosis result for 35 patients, with gastric antrum being the most common lesion (40%), muscularis mucosa being the most common level of lesion causes (45.71%), and stromal tumor (25.71%) being the most frequent type of lesions (Tables 3-5).

Treatment Results.
Among the 160 patients, 83 patients (77 cases with polyps, 4 cases with stromal tumors, 1 case with malignant lesions, and 1 case with papilloma) underwent high-frequency electrocoagulation resection, and 6 patients (2 cases with polyps, 1 case with stromal tumors, 1 case with adenoma, 1 case with papilloma, and 1 case with cysts) underwent high-frequency electrocoagulation resection, with good healing of the wound 6 months after treatment and no local recurrence after 6-24 months of followup. Of 69 patients (2 cases with polyps, 42 cases with stromal tumors, 15 cases with malignant lesions, 4 cases with lipoma, 3 cases with adenoma, 1 case with hemangioma, 1 case with schwannoma, and 1 case with lymphangioma) who received mucosal dissection-tumorectomy, 3 cases experienced intraoperative bleeding, and 2 cases had delayed postoperative bleeding, for which hemostasis was performed successfully. Due to the large tumor body and the risk of perforation, 2 patients (1 case with stromal tumors and 1 case with malignant lesions) were transferred to surgical treatment, in which the tumors were further determined as gastric fundus stromal tumors, with a propensity for malignancy. The 2 patients were lost at postoperative follow-up (see Table 6 for details).

Discussion
In the diagnosis of gastric eminence lesions, EUS presents the shape and size of the lesion through endoscopy and clearly shows the structure of the stomach wall, from the mucosal layer to the muscularis mucosa, the submucosal layer, the muscularis propria, and the serosal layer, with hyperecho, hypoecho, hyperecho, hypoecho, and hyperecho signals, respectively. It yields high accuracy in determining the size of the lesion and the origin and range of the lesion tissue [21][22][23][24].
With pathological results as the gold standard, the detection rate of EUS was 78.13%. 35 patients had unclear EUS results, with gastric antrum being the most common lesion (40%), muscularis mucosa being the most common level of lesion causes (45.71%), and stromal tumor (25.71%) being the most frequent type of lesion, indicating a high rate of missed diagnosis of the stromal tumors, which is consistent with the research results by Ikoma et al. [25]. MSCT can realize multidirectional and multiangle observation of the lesion by using technologies such as MPR, which clearly presents the tumor size, location, shape, growth pattern, boundary, enhancement characteristics, ulcer, and calcification degree and shows the relationship between the disease and surrounding organs and lymph node metastasis, especially for stromal tumors. In the present study, the detection rate of MSCT was 90.63%, which was significantly higher than that of 78.13% for EUS.
The common pathological types of gastric eminence lesions tumor include polyps and stromal tumors, with the most common sites of lesions in the gastric antrum, followed by the fundus of the stomach and the gastric body. Gastric eminence lesions mostly originate from the mucosal layer and muscularis mucosa, accounting for 83.13% of the total. With the joint diagnosis as a reference, the ROC curve revealed a higher diagnostic efficiency of MSCT versus EUS. Clinically, misdiagnosis is frequently seen in stromal tumors as hypoechoic and well-defined masses in EUS. Stromal tumors mostly occur in the fundus of the stomach, which originate in the muscle layer. The signs of MSCT for mesenchymal tumors are intracavernous growth with clear borders and uniform enhancement on enhancement scans when the tumor is small in size and irregular in shape with blurred borders and inhomogeneous enhancement on enhancement scans when the tumor is large in size. In terms of misdiagnosis in the present study, EUS mostly involved stromal tumors, while MSCT had a high diagnostic yield for stromal tumors, suggesting that MSCT plays a certain auxiliary role in distinguishing stromal tumors. The ROC revealed that in the diagnosis of gastric eminence lesions, the performance of a single ultrasound image is undesirable, while the Among the 160 patients, 83 underwent high-frequency electrosurgery, and 6 underwent nylon thread ligation, with good healing of the wound 6 months after treatment and no local recurrence after 6-24 months of follow-up. Of 69 patients who received mucosal dissection-tumorectomy, 3 cases experienced intraoperative bleeding and 2 cases had delayed postoperative bleeding, for which hemostasis was performed successfully; 2 cases were transferred to surgical treatment. In this study, no cases of perforation were found, which may be attributed to the operation skills or the small sample size of this study, suggesting that mucosal dissection-tumorectomy is safe in the treatment of gastric eminence lesions and can enhance the treatment effect. The microultrasound of ultrasound endoscopy cannot penetrate the intrinsic muscle layer of the tumor and     identify the level of lesion, and some patients have peritoneal fibrosis and inflammatory reaction, which may further thicken the esophageal wall and adversely affect the accuracy of staging diagnosis. MSCT is a cross-sectional scan, which cannot effectively distinguish esophageal cancer from the normal esophageal wall and is less effective in identifying soft tissues.
Chinese medicine has accumulated a wealth of experience in the treatment of gastric eminence lesions, which can effectively relieve symptoms and enhance clinical efficacy. Gastric eminence lesions can be treated with catgut embedding acupuncture. The catgut used is an allogeneic protein, and when the allogeneic protein is buried in the acupuncture point, the body's rejection reaction to the allogeneic protein continues to stimulate the acupuncture point, thereby achieving the purpose of treating diseases, with the advantages of economic applicability, simple operation, short duration, and high efficiency.

Conclusion
The accuracy of MSCT in the diagnosis of gastric eminence lesions is significantly higher than that of EUS, both of which can offer useful guidance for the choice of endoscopic treatment methods. The combination of MSCT and EUS examination before endoscopic gastroscopy may provide a better treatment efficacy on gastric protruding lesions with high safety. The limitation of this study is that less followup study was performed in postoperative patients; therefore, this study only serves as a guide for diagnosis, and further research in the treatment is required in future studies.

Data Availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.